chore: regenerate BACKLOG.md after #136 closure

Reflects #136 transition from stage:deliver to stage:done.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: davidmatousek

docs/product/_backlog/BACKLOG.md

@@ -1,6 +1,6 @@
 # Backlog
 
-> Auto-generated from GitHub Issues on 2026-04-10T18:56:34Z.
+> Auto-generated from GitHub Issues on 2026-04-10T18:58:23Z.
 > Source of truth: GitHub Issues with `stage:*` labels.
 > Regenerate: `/aod.status` or `.aod/scripts/bash/backlog-regenerate.sh`